Yttrium aluminum perovskite activated by cerium is a fast, mechanically and chemically resistant scintillation material. These scintillators have very low energy secondary X-ray emission, which is of advantage in imaging applications. YAP:Ce detectors are used for gamma and X-ray counting, electron microscopy, electron and X-ray imaging screens. The materials scintillation and mechanical properties enable their use in tomography systems.

Technical parameters


Physical properties
Density 5.37 g/cm3
Hardness by Mohs 8.6
Index of refraction 1.95
Melting point 1875°C
Thermal expansion 0.4-1.1 x 10-5/K
Crystal structure rhombic
Hygroscopic NO



 Luminescence properties
Wavelength of max. emission 370 nm
Decay constant 25 ns
Afterglow <0.005 % at 6 ms
Radiation length for 511 keV 2.7 cm
Photon yield at 300 K (27°C) 25 x 103 Ph/MeV
Integrated light output compared to NaI:Tl 70 % NaI:Tl